Writing instrument



FIG. 1 is a front elevational view of a writing instrument showing my new design;

FIG. 2 is a left side elevational view of the writing instrument, the right side elevational view being a mirror image thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The pattern on the barrel of the writing instrument is continuous throughout the area indicated. 

The ornamental design for a writing instrument, as shown and described. 